Movement of lymph fluid primarily accomplishes what?

• A. Pumps blood to the heart
• B. Stores vitamins
• C. Circulates lymph to filter pathogens
• D. Regulates appetite

Answer: (C)

Movement of lymph fluid is essential for immune surveillance. As lymph travels through lymphatic vessels, it picks up microbes, debris, and foreign particles from tissues and carries them to lymph nodes. In the nodes, immune cells inspect the material; pathogens are filtered out or flagged for an immune response. This filtration process is the core way lymph movement helps protect the body. While lymph flow also helps maintain tissue fluid balance and can transport fats from the gut, the primary function described here is circulating lymph to filter pathogens.